脉冲激光再制造船用5083铝合金防护板试验研究

The Experimental Study Marine 5083 Aluminium Alloy Protective Plate forPulsed Laser Remanufacturing

摘要:

针对远洋舰船铝合金防护板受风浪、潮汐以及随机性爆炸冲击波影响，易萌生裂纹或产生断裂的工程实际。通过控制有限单元“生死”状态，动态模拟了防护板脉冲激光再制造温度场变化历程，获取了再制造过程温度变化规律，并对脉冲激光再制造工艺进行了优化。分析和试验结果表明：脉冲模式优化工艺参数为激光功率3kW，光斑直径3mm，扫描速度6mm/s，脉冲激光脉宽10ms，占空比1:1。成形后防护板热影响区变形量控制在0.02mm以内，硬度最大值出现在热影响区，约为95HV0.1。焊缝区与母材呈致密的冶金结合，主要为致密的细晶组织，抗拉强度达到222Mpa。

Abstract:

Aiming at the fact that the oceangoing vessel protective plates is affected by the stormy waves, the tide and the random explosion shock wave, the spallation and cracks are easily caused. By controlling the finite element "life and death" state, the temperature field field dynamic process of pulsed laser remanufacture was simulated. The derivation law of temperature field in forming process was obtained, the forming process of pulse laser remanufacturing was optimized. The analysis and test results show that, the pulsed optimization process parameters are laser power 3KW, the spot diameter is 3mm, the scanning speed is 6mm/s, the pulsed laser pulse width 10ms, the duty cycle is 1:1. The heat affected zone deformation after forming is controlled within 0.02mm, the maximum hardness is 95HV0.1 which appeares in the heat affected zone. The heat affected zone is closely metallurgical bonded with the base metal, the weld is mainly consisted of fine grained structure, the tensile strength is up to 222Mpa.